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Probably will last longer down there too as you only get compressive forces and not shear forces (is that the right term?). Smush instead of smush and twist, I guess.

Is Peak selling replacement QTC pills for their lights separately at this point? If you can get one, can they just be dropped down in a light like the Sapphire or are the bodies specially machined to accept them?

Re: Standing wave of Sapphire 25's + NEW GS

Kinda wierd. The light would not work with the QTC at the bottom, the head would not screw down far enough. But after playing with the light for a couple of hours the QTC fits fine at the negetive end and it does work much better too.

NBP,
I bought my QTC from smarkum, 16 little squares for next to nothing.

Re: Standing wave of Sapphire 25's + NEW GS

Originally Posted by Drywolf

Kinda wierd. The light would not work with the QTC at the bottom, the head would not screw down far enough. But after playing with the light for a couple of hours the QTC fits fine at the negetive end and it does work much better too.

NBP,
I bought my QTC from smarkum, 16 little squares for next to nothing.

Yes, they do tend to compress a bit over time - not much, but the tolerances in the Sapphire are tight.

I think Nick is referring to the "pill" that holds the QTC, not the QTC itself, and I do not think that Peak sell them separately (for now, anyway).

Re: Standing wave of Sapphire 25's + NEW GS

Just wondering if anyone has fooled around with QTC and this light? Specifically, if there is a better way to mount it than just putting a piece between the positive battery terminal and the head.

Thanks,
Frank

.

Don't put it at the front end as it could conceivably make contact with the LED leads or even ground for some shorting out or other problems. It will work in the bottom of the battery pak but I think you will find the O-ring doesn't get covered completely when you have the light "off". You could remove the silver ring anode contact from the PCB which would give you some more "Z" room and allow the head to tighten down further.

Re: Standing wave of Sapphire 25's + NEW GS

I know this does not make sense, but it would not work on the negetive side. I think it had to do with the light and not the QTC compressing. Maybe there was something down there that worked it way out? Anyway after playing with it the QTC fits at the botom nicely and works great.

This little light just feels great in my fingers. Another great light Don!!

Re: Standing wave of Sapphire 25's + NEW GS

The positive terminal on the battery (and the silver bead on the back of the driver board) focus the pressure on the very center of the QTC material, so the same amount of twisting force equals greater pressure on the center of the QTC material. That makes it easy to compress one part of the QTC material enough to make it conduct electricity. When you put the QTC material at the negative terminal on the battery, there is no such mechanism to amplify your twisting force.

Contact with the LED leads could be problematic, but it can also be easily fixed by coating the back of the driver board with clear nail polish.

I re-iterate my earlier point: the driver in the Sapphire 25 is designed to self-adjust for the battery's power output so it can send 25mA to the LED at all times. When you introduce a resistor into the input side of the circuit, you accomplish little more than making the driver's job harder. It would be better to add QTC material to an old, non-regulated Sapphire -- or a Ti Arc AAA.

Re: Standing wave of Sapphire 25's + NEW GS

Originally Posted by mattp

I have these 2 lights, I'll try and get a comparison shot tonight.

Thanks! Most appreciated! I just need a comparison of the lowest output of the ReVO. No need for medium and high. I just want to know what kind of output the Sapphire GS has and the beam profile compared to ReVO.

Re: Standing wave of Sapphire 25's + NEW GS

Sapphire GS:

4Sevens Preon Revo SS (S2 led) on LOW:

Both with fresh Eneloops.

For completeness sake,
4Sevens Preon Revo SS (S2 led) on MEDIUM:

4Sevens Preon Revo SS (S2 led) on HIGH:

In a dark environment the Sapphire is brighter than you'd expect! I find the beam and tint perfect to read by as well.
The photos were taken from ~2m from the wall (I was standing at the end of a bed and shining them at the wall, which is a grey colour and fairly accurately represented by the Sapphire photo).
I hope this helps, I've replaced the Revo on my keychain with the Sapphire GS, for what it's worth.
Cheers, Matt.

Re: Standing wave of Sapphire 25's + NEW GS

Thanks mattp for taking the trouble to do this. The beam looks good and smooth. I think this is the perfect low light that I would need. I can't imagine how long it would take me to deplete an Energizer lithium L92 battery in there.

Re: Standing wave of Sapphire 25's + NEW GS

Originally Posted by pjandyho

Thanks mattp for taking the trouble to do this. The beam looks good and smooth. I think this is the perfect low light that I would need. I can't imagine how long it would take me to deplete an Energizer lithium L92 battery in there.

Hey bro,

I thought your 4th would be a makai!

"Live as if you were to die tomorrow, learn as if you were to live forever"
Ghandi.

Re: Standing wave of Sapphire 25's + NEW GS

I now have two Sapphires!

The one is a 25 GS and it's a great general usage AAA flashlight. I'd love to know its real runtime on an Energizer Lithium battery as I haven't found this info anywhere.

The second Sapphire is a high cri mule which Don still had and was willing to part with (thanks Don!): Now this Sapphire is something else!! It has amazing CRI and to my eyes it is quite a bit better especially on blue colors than my Peak Eiger XPG high cri and equal to my High CRI Nichia 219 from Illumination Supply which I put in a HDS. It is slightly dimmer than the 25 GS but it is quite adequate for general use. I consider myself very lucky to have obtained this light.

I own quite a few AAA flashlights by now but so far the Sapphires are my favorites!